Stuck at HTC white screen with HTC symbol, what should I do?

[14happydays]

stuck at htc white screen with htc symbol

my phone is restarting every 30seconds.i rooted it using TWRP and all was fine.but sudenly i got htc white screen...i tried t=factory reset,wipe data,hard reset,fastboot,all the options available while pressing volume down+power button..it says data wiped successfuly and when i press reboot it wil again come to htc white screen....please tell me what to do.it is t-mobile u s set...i am struck at white screen with htc symbol..please anybody reply me what to do fastly ??my brother is gonna kill me..i am worried..save me please...